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Preventing Cascading Outages by Intentional Controlled Islanding. CAMS /RRPA Panel Session Mitigation and Prevention of Cascading Outages: Methodologies and Practical Applications PES General Meeting, Vancouver, Canada July 24, 2013

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preventing cascading outages by intentional controlled islanding

Preventing Cascading Outages by Intentional Controlled Islanding

CAMS/RRPA Panel Session

Mitigation and Prevention of Cascading Outages: Methodologies and Practical Applications

PES General Meeting, Vancouver, Canada

July 24, 2013

V.Terzija (Manchester), P.Wall (Manchester), J.Quirós-Tortós (Manchester),

S.Norris (Durham), J.Bialek (Durham)

vladimir.terzija@manchester.ac.uk

outline
OUTLINE

Concept of Intelligent Controlled Islanding

Importance of Intelligent Controlled Islanding

Challenges of Intelligent Controlled Islanding

Present state of Research

Detailed Example

Ensuring the survival of the Islands

IEEE Vancouver, July 21-25, 2013

concept of ici
Concept of ICI
  • Islands need to be able to operate as isolated power systems until system restored

Simple example of the concept of ICI

IEEE Vancouver, July 21-25, 2013

concept of ici1
Concept of ICI

Separate the system into a set of sustainable and isolated islands

Controlled separation avoids an uncontrolled cascade of failures in the system

Separation reduces the sources of dangerous oscillations in the system and mitigates the risk of electrical centres forming

IEEE Vancouver, July 21-25, 2013

concept of ici blackout prevention
Concept of ICI – Blackout Prevention

IEEE Vancouver, July 21-25, 2013

importance of ici
Importance of ICI

Increasing risk of blackouts must be countered and ICI has the potential to limit their occurrence and impact

Implementing Islanding before the collapse will keep some of the system operating

Limits immediate consequences of blackout e.g. interruptions.

Eases restoration as will ensure that black start of entire system is avoided

IEEE Vancouver, July 21-25, 2013

challenges of ici
Challenges of ICI

Detecting need for islanding prior to fast cascade stage of collapse into blackout

Determining the islands that should be created and how best to do so

The time at which to implement the ICI plan

IEEE Vancouver, July 21-25, 2013

challenges of ici1
Challenges of ICI
  • These challenges can be separated into:
    • WHERE to island?
    • WHEN to island?
    • HOW to island?

IEEE Vancouver, July 21-25, 2013

existing ici research graph partitioning
Existing ICI Research Graph Partitioning
  • Graph Partitioning
    • Simulated annealing
    • Ordered Binary Decision Diagram
    • MinimialCutset enumeration
  • Represent the system as a graph of vertices and edges

IEEE Vancouver, July 21-25, 2013

existing ici research graph partitioning1
Existing ICI Research Graph Partitioning
  • Find the set of edges that ‘best’ separate the vertices
  • ‘Best’ is defined according to an objective function and a set of constraints
  • Objective functions include
    • Minimum dynamic coupling
    • Minimum power flow disruption
    • Minimum power imbalance

IEEE Vancouver, July 21-25, 2013

existing ici research generator grouping
Existing ICI ResearchGenerator Grouping
  • Generator Grouping
    • Slow Coherency
    • Synchrony Clustering
    • Eigen Value sensitivity
  • Identify generator groups that swing together
  • Separate the system to keep these groups together

IEEE Vancouver, July 21-25, 2013

role of emerging technology
Role of Emerging Technology
  • Synchronised measurement technology will play a key role in any ICI scheme
  • ICI requires accurate system measurements for both:
    • The quasi steady state operation (for coherency analysis)
    • The evolution of the blackout (for determining island boundaries, availability of resources and present state of the proposed islands)

IEEE Vancouver, July 21-25, 2013

example solution for ici problem
Example Solution for ICI Problem

A two step method is proposed in “Two-Step Spectral Clustering Controlled Islanding Algorithm”, L. Ding, F. Gonzalez-Longatt, P. Wall and V. Terzija

This method is a hybrid of the graph partitioning and generator grouping methods

The generator grouping is performed by forming a graph of the dynamic coupling

IEEE Vancouver, July 21-25, 2013

example solution for ici problem separation of ieee test systems
Example Solution for ICI ProblemSeparation of IEEE Test Systems

New England 39-bus, IEEE 118-bus

IEEE Vancouver, July 21-25, 2013

summary
Summary

ICI has been proposed as a potential tool to counter the increasing threat of blackouts

ICI has the potential to avert a blackout or greatly ease restoration by ensuring part of the system survives

The ICI problem is complex and any solution must consider a number of factors

Execution time is critical due to the rapid development of some blackouts

IEEE Vancouver, July 21-25, 2013

preventing cascading outages by intentional controlled islanding1

Preventing Cascading Outages by Intentional Controlled Islanding

CAMS/RRPA Panel Session

Mitigation and Prevention of Cascading Outages: Methodologies and Practical Applications

PES General Meeting, Vancouver, Canada

July 24, 2013

V.Terzija, P.Wall, J.Quirós-Tortós, S.NorrisJ.Bialek

vladimir.terzija@manchester.ac.uk